STOCKHOLDERS' EQUITY - Accumulated Other Comprehensive Income (Loss) Rollforward (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (294.8)	$ (287.3)	$ (257.5)	$ (284.8)
Other comprehensive income (loss) before reclassifications	40.6	(40.6)	(1.0)	(47.4)
Amounts reclassified from AOCI	0.3	27.6	4.6	31.9
Net other comprehensive income (loss)	40.9	(13.0)	3.6	(15.5)
Ending balance	(253.9)	(300.3)	(253.9)	(300.3)
CTA
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(243.5)	(231.7)	(208.2)	(225.6)
Other comprehensive income (loss) before reclassifications	45.0	(51.9)	9.7	(58.0)
Amounts reclassified from AOCI	0.0	26.1	0.0	26.1
Net other comprehensive income (loss)	45.0	(25.8)	9.7	(31.9)
Ending balance	(198.5)	(257.5)	(198.5)	(257.5)
Derivative Hedging Adj.
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(7.1)	(3.5)	(0.8)	(4.4)
Other comprehensive income (loss) before reclassifications	(2.7)	(3.5)	(12.5)	(5.7)
Amounts reclassified from AOCI	(0.1)	2.0	3.4	5.1
Net other comprehensive income (loss)	(2.8)	(1.5)	(9.1)	(0.6)
Ending balance	(9.9)	(5.0)	(9.9)	(5.0)
Debt & Equity Securities Adj.
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	3.6	2.1	2.6	0.8
Other comprehensive income (loss) before reclassifications	0.3	0.4	1.3	1.7
Amounts reclassified from AOCI	0.0	0.0	0.0	0.0
Net other comprehensive income (loss)	0.3	0.4	1.3	1.7
Ending balance	3.9	2.5	3.9	2.5
Pension Liability Adj.
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(47.8)	(54.2)	(51.1)	(55.6)
Other comprehensive income (loss) before reclassifications	(2.0)	14.4	0.5	14.6
Amounts reclassified from AOCI	0.4	(0.5)	1.2	0.7
Net other comprehensive income (loss)	(1.6)	13.9	1.7	15.3
Ending balance	$ (49.4)	(40.3)	$ (49.4)	(40.3)
Demag-Mobile Cranes Business [Member] \| Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest \| U.S. Plan \| Pension Plan
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Amounts reclassified from AOCI		26.1		26.1
Reclassification from AOCI, Current Period, Tax		$ 2.8		$ 2.8

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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